Toner for developing electrostatic images and developer

US20130171557A1Inactive Publication Date: 2013-07-04RICOH KK
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  • Toner for developing electrostatic images and developer

Examples

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production example 1

Synthesis of Crystalline Polyester Resin 2

[0275]A 5 L four-neck flask equipped with a nitrogen-introducing pipe, a drainpipe, a stirrer and a thermocouple was charged with 2,500 g of 1,12-decanediol, 2,330 g of 1,8-octanedioic acid, and 6.9 g of hydroquinone, and the mixture was allowed to for 10 hours at 180° C., then for 4 hours at 200° C., followed by reacting for 5 hours at 8.3 kPa to thereby synthesize Crystalline Polyester Resin 2. The DSC thermal characteristics (melting point), weight average molecular weight Mw as measured by GPC, molecular weight distribution, acid value, hydroxyl value, and onset temperature of Crystalline Polyester Resin 2 are presented in Tables 1-1 and 1-2.

production example 2

Synthesis of Crystalline Polyester Resin 1

[0276]A 5 L four-neck flask equipped with a nitrogen-introducing pipe, a drainpipe, a stirrer and a thermocouple was charged with 2,500 g of 1,12-decanediol, 2,330 g of 1,8-octanedioic acid, and 2.9 g of hydroquinone, and the mixture was allowed to for 30 hours at 180° C., then for 10 hours at 200° C., followed by reacting for 15 hours at 8.3 kPa to thereby synthesize Crystalline Polyester Resin 1. The DSC thermal characteristics (melting point), weight average molecular weight Mw as measured by GPC, molecular weight distribution, acid value, hydroxyl value, and onset temperature of Crystalline Polyester Resin 1 are presented in Tables 1-1 and 1-2.

production example 3

Synthesis of Crystalline Polyester Resin 3

[0277]A 5 L four-neck flask equipped with a nitrogen-introducing pipe, a drainpipe, a stirrer and a thermocouple was charged with 2,500 g of 1,12-decanediol, 2,330 g of 1,8-octanedioic acid, and 8.9 g of hydroquinone, and the mixture was allowed to for 6 hours at 180° C., then for 3 hours at 200° C., followed by reacting for 4 hours at 8.3 kPa to thereby synthesize Crystalline Polyester Resin 3. The DSC thermal characteristics (melting point), weight average molecular weight Mw as measured by GPC, molecular weight distribution, acid value, hydroxyl value, and onset temperature of Crystalline Polyester Resin 3 are presented in Tables 1-1 and 1-2.

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Abstract

To provide a toner containing: a binder resin containing a non-crystalline polyester resin and a crystalline polyester resin; a colorant; and wax, wherein the toner satisfies the following formula 1, and has loss tangent of 1 or smaller at 80° C. or higher, B−A<20 Formula 1 where A represents a melting point of the crystalline polyester resin and B represents a temperature at which the toner has storage modulus G′ of 20,000 Pa.

Description

TECHNICAL FIELD[0001]The present invention relates to a toner for developing electrostatic images and a developer containing the toner, both of which are applied in electrophotographic image forming apparatuses such as a photocopier, a printer, and a facsimile machine.BACKGROUND ART[0002]Recently, demands in the market include to down size particles diameters of toners for improving image qualities of output images, and to improve low temperature fixing abilities of toners for energy saving.[0003]A toner obtained by the conventional kneading-pulverizing method has irregular shapes with a broad particle size distribution, and it is difficult to obtain smaller particle diameters of a toner by such a method. Moreover, the toner obtained by this method has various problems, including the above, such as high energy requirements for fixing. Especially, during the fixing, the toner produced by the kneading-pulverizing method has a large amount of a releasing agent (wax) present at surfaces...

Claims

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Application Information

Patent Timeline
04 Jul 2013
Publication
US20130171557A1
IPC
G03G9/087; G03G9/08
CPC
G03G9/081; G03G9/0806; G03G9/0804; G03G9/08797; G03G9/08755; G03G9/08795; G03G9/08; G03G9/087
Inventors
WATANABE, NAOHIRO; SUGIMOTO, TSUYOSHI